12=18-a

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Solution for 12=18-a equation: 



12=18-a

We move all terms to the left:

12-(18-a)=0

We add all the numbers together, and all the variables

-(-1a+18)+12=0

We get rid of parentheses

1a-18+12=0

We add all the numbers together, and all the variables

a-6=0

We move all terms containing a to the left, all other terms to the right

a=6

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